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Old Dec 07, 2012, 12:02 PM
peterlngh is offline
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To put it very simply...

A small prop spinning fast will help a plane dive fast while a big prop spinning slower will make a plane climb fast. Since the motor in a powered glider is just a means to gain altitude fast, big slow props are better. Mostly it's due to blade area.

A prop is just a wing that spins. A bigger "wing" gives more lift which, when it's applied to a propeller, means more thrust. This is especially obvious at low airspeed and that's where performance, for anything but a hotliner, is most important. In fact, excessive speed can be a problem with any plane with a lifting airfoil.
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